wecome to HCM
post delivery return of periods may b irregular n delayed due to effect of lactation
on hormone balance. But r u sure it is menses. If u pads blood during stools only then it cud b a bleeding piles which too is common after pregnancy
.in any case the cramps n bleeding if persist for 2 more days then its best to visit ur gynaec for further treatment.if it stops or u r sure it is menses only then no need to worry.